Comparison between the effects of 4 different electrical stimulation current waveforms on isometric knee extension torque and perceived discomfort in healthy women

2014 ◽  
Vol 51 (1) ◽  
pp. 76-82 ◽  
Author(s):  
Lucas Ogura Dantas ◽  
Amilton Vieira ◽  
Aristides Leite Siqueira ◽  
Tania Fatima Salvini ◽  
João Luiz Quagliotti Durigan
Keyword(s):  
Electrical Stimulation ◽  
Knee Extension ◽  
Healthy Women ◽  
Isometric Knee Extension ◽  
Stimulation Current

Kilohertz and Low-Frequency Electrical Stimulation With the Same Pulse Duration Have Similar Efficiency for Inducing Isometric Knee Extension Torque and Discomfort

2017 ◽  
Vol 96 (6) ◽  
pp. 388-394 ◽  
Author(s):  
Flávia Vanessa Medeiros ◽  
Martim Bottaro ◽  
Amilton Vieira ◽  
Tiago Pires Lucas ◽  
Karenina Arrais Modesto ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Pulse Duration ◽  
Low Frequency ◽  
Knee Extension ◽  
Isometric Knee Extension

scholarly journals Disparate kinetics of change in responses to electrical stimulation at the thoracic and lumbar level during fatiguing isometric knee extension

2020 ◽  
Vol 128 (1) ◽  
pp. 159-167 ◽  
Author(s):  
Callum G. Brownstein ◽  
Robin Souron ◽  
Nicolas Royer ◽  
Benjamin Singh ◽  
Thomas Lapole ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Evoked Potential ◽  
Isometric Exercise ◽  
Silent Period ◽  
Knee Extension ◽  
Lower Limbs ◽  
Evoked Responses ◽  
Time Points ◽  
Isometric Knee Extension ◽  
Kinetics Of

The present study compared the fatigue-induced change of matched-amplitude thoracic evoked potential (TMEP) and lumbar evoked potential (LEP) following electrical stimulation. Ten participants performed a 3 × 3 min isometric knee extension contraction separated by 4 min of recovery at the level of EMG required to produce 50% maximal voluntary contraction (MVC) force at baseline. The TMEP and LEP were evoked during the ongoing contraction at baseline and every minute into the fatiguing protocol and during recovery. Both responses were also assessed during a transcranial magnetic stimulation (TMS) evoked silent period to elicit a TMS-TMEP and TMS-LEP to assess responses without the confounding influence of descending drive. The results displayed disparate kinetics of the TMS-TMEP and TMS-LEP throughout the fatiguing protocol. The TMS-TMEP was reduced at all time points during exercise ( P < 0.001), whereas the TMS-LEP was reduced at 2 min into set 1 and 1 min into sets 2 and 3 ( P ≤ 0.04). TMS-LEPs were higher than the TMS-TMEPs at most time points ( P ≤ 0.04). No change was observed in the TMEP or LEP. When evoked during the silent period, the reduction in TMEP is greater than the LEP during fatiguing isometric exercise. The disparate kinetics of change suggest that differential mechanisms are responsible for evoked responses to thoracic and lumbar stimulation. More research is required to identify the mechanisms responsible for the TMEP and LEP before precise inferences can be made on what fatigue-induced changes in these variables reflect. NEW & NOTEWORTHY Assessing spinal excitability using lumbar stimulation when measuring responses in lower limbs has been suggested as an alternative method that could circumvent the issues associated with thoracic stimulation. The present study compared responses to the two types of stimuli throughout a fatiguing protocol and demonstrated that lumbar evoked responses differ substantially from thoracic responses when measured in the absence of voluntary drive. These findings suggest that different mechanisms are responsible for evoked responses to thoracic and lumbar stimuli.

Effect of the Simultaneous Application of NMES and HVPC on Knee Extension Torque

2007 ◽  
Vol 16 (4) ◽  
pp. 307-318 ◽  
Author(s):  
William Holcomb ◽  
Mack D. Rubley ◽  
Tedd J. Girouard
Keyword(s):  
Electrical Stimulation ◽  
Athletic Training ◽  
Outcome Measure ◽  
Peak Torque ◽  
Knee Extension ◽  
Stimulation Protocol ◽  
Simultaneous Application ◽  
Efficient Treatment ◽  
Main Outcome Measure ◽  
Isometric Knee Extension

Context:Electrical stimulation using simultaneous application of two current types for multiple effects is a current treatment option, but the effect of this treatment is not currently known.Objectives:To compare isometric knee extension torque when using neuromuscular electrical stimulation (NMES) in combination with High Voltage Pulsed Current (HVPC) versus NMES alone during three contraction conditions of quadriceps.Design:Counterbalanced, within-subjects design to test independent variables, stimulation protocol, and contraction condition; ANOVA to analyze dependent variable, peak torque.Setting:Athletic Training Research Laboratory. Participants: 14 healthy subjects (7 male and 7 female, age = 21.9 ± 2.0 yr, height = 173.4 ± 10.1cm, weight = 76.1 ± 16.7 kg).Intervention:Participants performed three contraction conditions during two stimulation protocols.Main Outcome Measure:Peak isometric knee extension torque.Results:The main effect for Stimulation Protocol was not significant: F1,26 = .01, P = .94.Conclusion:Simultaneous application of HVPC with NMES does not facilitate the neuromuscular response but may provide an efficient treatment when managing atrophy, strength loss, pain, and edema associated with reconstructive surgery.

scholarly journals Skinfold thickness affects the isometric knee extension torque evoked by Neuromuscular Electrical Stimulation

2015 ◽  
Vol 19 (6) ◽  
pp. 466-472 ◽  
Author(s):  
Flávia V. A. Medeiros ◽  
Amilton Vieira ◽  
Rodrigo L. Carregaro ◽  
Martim Bottaro ◽  
Nicola A. Maffiuletti ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Neuromuscular Electrical Stimulation ◽  
Skinfold Thickness ◽  
Knee Extension ◽  
Isometric Knee Extension

scholarly journals EARLY STRENGTH TESTING AFTER ACL RECONSTRUCTION IMPACTS ISOKINETIC STRENGTH PERFORMANCE AT TIME OF RETURN TO SPORT

2021 ◽  
Vol 9 (7_suppl3) ◽  
pp. 2325967121S0011
Author(s):  
Adam Weaver ◽  
Dylan Roman ◽  
Maua Mosha ◽  
Nicholas Giampetruzzi
Keyword(s):  
Test Performance ◽  
Knee Extension ◽  
Strength Test ◽  
Strength Testing ◽  
Isokinetic Strength ◽  
Rehabilitation Process ◽  
Strength Performance ◽  
Knee Extension Strength ◽  
Isometric Knee Extension ◽  
Strength Tests

Background: The standard of care in ACL reconstruction (ACLR) typically involves standardized strength testing at 6 months or later to assess a patient’s readiness to return to play (RTP) using isokinetic and isometric testing, and functional strength testing. Recent literature suggests that isokinetic knee extension strength should demonstrate 89% limb symmetry index (LSI) or greater prior to returning to sport. However, there is little known on the effects of strength testing early in the rehabilitation process and the relationship to strength test performance at time of RTP. Purpose: The purpose of this study was to examine how early post-operative strength test performance impacts isokinetic strength outcomes at RTP testing in adolescents. Methods: The retrospective cohort study included patients undergoing primary ACLR between 12 and 18 years of age, early post-operative strength measures, and isokinetic dynamometer strength at RTP from July 2017 and April 2019. Data was dichotomized into desired outcomes at 3 months: >70% isometric knee extension LSI, > 20 repetitions on anterior stepdown test (AST), > 90% LSI Y Balance. At RTP testing, isokinetic knee extension strength data was categorized into >89% LSI at 3 speeds (300, 180, 60°/sec). Chi square testing and odds ratio statistics were used to examine association and its magnitude. Results: 63 patients met inclusion criteria (38 females; 15.37±1.66 years old). >70% LSI isometric knee extension strength at 3 months showed a significant association (Table 2) and demonstrated the strongest odds of having >89% LSI on isokinetic strength tests at all 3 speeds at RTP with 180°/sec being the highest (OR=14.5; 95% CI=4.25,49.43; p= <0.001). Performance on AST showed a significant association (χ2 (1, n=63) = 17.00, p <0.001), and highest odds at 180°/sec (OR=4.61; 95% CI = 1.59, 13.39, p=<0.001) and 60°/sec (OR= 3.07; 95% CI = 1.10, 8.63, p= 0.04). Combination of performance on isometric strength tests and AST showed a significant association to isokinetic strength at all three speeds, but less predictive then isometrics in isolation. (Table 2). There was no significant relationship between YBR LSI at 3 months and isokinetic strength at 6 months. Conclusion: Standardized strength testing early in rehabilitation can help identify patients that will successfully complete RTP testing. Our results suggest that isometric knee extension strength and timed anterior stepdown test provide meaningful clinical information early in the rehabilitation process. This data also suggests that the use of YBAL for predicting isokinetic strength performance is limited. [Table: see text][Table: see text]

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